The famous poet Jim Harrison was blinded in one eye when he was 7 years old. He claimed that he learned to live with the infirmity, though he ended up knocking over a lot of displays and dumping into people, which left him constantly apologizing. Many cosplayers and people in pirate costumes with eye patches can empathize with this loss of stereoscopic vision. So, someone was finally wise enough to come up with a costume pirate eye patch that you could actually see through.
From the outside the special fabric of this eye patch is opaque. Though you can easily see through it, which makes it great for attending a costume party without bumping into something every 10 seconds. The band is one-size-fits-most adult heads.